Nikelshparg Matvey I. RussiaSaratovМАОУ «Гимназия № 3», Саратовmatveynikel@yandex.ru Author's articles Genetic Polymorphism in Populations of Hieracium × robustum (Asteraceae) as Result of the Hallabrottet Aulacidea hieracii (Hymenoptera: Cynipidae) Influence Antagonistic activity of Bacillus velezensis